fix typo on destroy

include/ldap_pvt_thread.h

@@ -164,7 +164,7 @@ LDAP_BEGIN_DECL
 LDAP_F int
 ldap_pvt_thread_initialize LDAP_P(( void ));
 LDAP_F int
-ldap_pvt_thread_destory LDAP_P(( void ));
+ldap_pvt_thread_destroy LDAP_P(( void ));
 
 LDAP_F unsigned int
 ldap_pvt_thread_sleep LDAP_P(( unsigned int s ));